You all know how magnets work, right? "The magnetization of a magnetized material is the local value of its magnetic moment per unit volume, usually denoted M, with units A/m. It is a vector field, rather than just a vector..........." Ok, maybe not. For simplicity let's just say it's magic. You know you've tried to push the two magnets together when the poles don't match up and wondered what kind of enchantment is going on.